updated 03:00 pm EDT, Fri March 28, 2008

iPhone SDK beta 2

Apple has released the second beta of its iPhone SDK for registered developers. The new release includes an Interface Builder, which allows the drag-and-drop integration of graphical components which can be linked to underlying Objective-C code created in Xcode. The new SDK build is a 1.3GB download, available from Apple's Developer Connection site. You must be a registered developer to download the SDK, but no fee or program acceptance is required. Apple's development kit uses the same programming language and interface used by Apple itself and now includes Cocoa Touch, an API designed to add touchscreen input.

Programmers now use a modified version of Xcode that is not only used to write programs for the iPhone but to manage them as well, by handling interface design, source control and debugging. Developers can also test the final results in an environment known as the iPhone Simulator.

Hundreds if not more of the developers who applied to Apple's iPhone Developer Program -- which allows access to the iPhone 2.0 beta release software -- have been at least temporarily rejected for membership. The $100 program promised developer support, entry to the iPhone AppStore and other benefits. Part of a published portion of the rejection letter reads: "We have received your enrollment request. At this time, the iPhone Developer Program is available to a limited number of developers and we plan to expand the program during the course of the beta period. We will contact you again regarding your enrollment status at the appropriate time."

Apple previously announced that in the first four days following the release of the beta iPhone SDK, over 100,000 downloads have been processed through the Apple Developer Connection, to which people must officially belong before they can use the software. "Developer reaction to the iPhone SDK has been incredible with more than 100,000 downloads in the first four days," reads a statement by Apple's senior VP of Worldwide Product Marketing, Philip Schiller. "Also, over one million people have watched the launch video on Apple.com, further demonstrating the incredible interest developers have in creating applications for the iPhone."